In the final scene where Carrie meets Doug in his IPS truck, the street sign Lafayette is visible. Underneath the street name on the sign is Culver City, the California city in which the show was filmed.
When Doug is speaking with Carrie about his trainee and Carrie is picking the mail up from the floor by the front door, you can see the boom mic in the reflection of the back window.
When Doug is in the UPS truck with his trainee Julie he tells her that the "sign-y thing" is a DICAD board. It is actually called a DIAD board.